Inside the plastic tube is a gold plated slip ring for 6 wires. There are six color coded wire sets made of 26 AWG and no matter how you twist the assembly, they will remain in continuity. Each of the wire sets can carry up to 2A at up to 240VAC or 240VDC. There’s a 44mm (1.7″) diameter flange with mounting holes to make it easy to attach or you can cut it off with a hacksaw and drill/machine as you wish it seems to just be ABS plastic. Rated to rotate up to 300 RPM (but you can probably go faster if you don’t mind a reduced life and/or noise).

I’ve been looking for a good slip-ring solution, failing to find one, and eventually working around (or failing to do so) for so long – literally decades, probably. It’s definitely time to revisit some of the old notebooks, and start putting together another Adafruit order!